MRCP vs ERCP for diagnosing PSC

What is known

• PSC has traditionally been diagnosed with ERCP, but MRCP (MRC) is rapidly emerging as a first-choice test that is non-invasive, radiation-free, and avoids the pancreatitis risk of retrograde studies. ¹
• A positive MRCP may obviate a diagnostic ERCP, whereas a negative MRCP does not exclude PSC and may necessitate ERCP as the gold standard. ²
• When MRCP is suboptimal, contraindicated, or not feasible (e.g., claustrophobia, metallic implants), ERCP should be considered to add accuracy to ductal delineation and establish the diagnosis. ³
• Studies have directly compared the diagnostic accuracy of MRCP against ERCP as the reference standard using morphologic PSC criteria and ROC analysis. ⁴

What is unknown / caveats

• The provided excerpts do not report the actual sensitivity, specificity, or accuracy figures from the head-to-head MRCP vs ERCP comparison studies
• Several relevant comparative studies appear only as reference-list citations without extractable results
• The excerpts describe the roles of each modality but do not give numeric accuracy values to quantify how closely MRCP matches ERCP.

References

1. Lindor KD. Characteristics of primary sclerosing cholangitis in the USA. Hepatol Res. 2007. PMID: 17931206.

2. Tharian B, George NE, Tham TC. What is the current role of endoscopy in primary sclerosing cholangitis?. World J Gastrointest Endosc. 2015. PMID: 26265986.

3. Bhat P, Aabakken L. Role of Endoscopy in Primary Sclerosing Cholangitis. Clin Endosc. 2021. PMID: 32380796.

4. Weber C, Krupski G, Lorenzen J, Grotelüschen R, Seitz U, Rogiers X, Adam G. [MRCP in primary sclerosing cholangitis]. Rofo. 2003. PMID: 12584620.

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Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct.